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I am new to C# and just learned that objects can be null in C# but int can't.
Also how does nullable int (int?) work in C#?
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Java primitive types (such as int , double , or float ) cannot have null values, which you must consider in choosing your result expression and host expression types.
No difference. int? is just shorthand for Nullable<int> , which itself is shorthand for Nullable<Int32> . Compiled code will be exactly the same whichever one you choose to use.
You can declare nullable types using Nullable<t> where T is a type. Nullable<int> i = null; A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, Nullable<int> can be assigned any value from -2147483648 to 2147483647, or a null value.
Nullable types are neither value types nor reference types.
int is a primitive type and only ReferenceTypes (objects) are nullable. You can make an int nullable by wrapping it in an object:
System.Nullable<int> i;
-or-
int? i;
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/using-nullable-types
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